Creating a new sidebar just give me another empty one: http://prntscr.com/g7bvva
Also the hide section doesn't show anything in any sidebar (default o new one): http://prntscr.com/g7bw4h
I already tried uninstalling the app with App Cleaner, and reinstalling it afterwards, but no luck. Issue persist.

Having PF7 closed (and not open in background), i selected "show in finder" inside Chrome. I had configured PF7 to open in any "in finder" as default. PF7 opens, and the sidebar is in there, restored as it was before.

Don't know what happened, really. PF7 stuck without a sidebar for a couple of hours, and it fixed itself just now.
If you need more info, just ask. Glad to provide logs or anything that can help you, guys.

Thanks for the time, and for this really great app. Can't work without it.
Esteban

That's the known bug which is caused by the fact that we use old API to communicate with the system, and it actually works but sometimes produces random glitches. Our developer is aware of the problems and I am sure he's working on a solution. I've tagged your support ticket so that I won't forget to inform you when the fix is available.